Group 1 - The article emphasizes the importance of health maintenance during the "Great Cold" solar term, which is the last and one of the coldest periods of winter [1] - Experts suggest preventing cold in the lungs, waist, and feet, and recommend outdoor activities with proper warm clothing to avoid catching a cold [3] - It is advised to perform exercises like toe raises and foot massages to improve blood circulation and prevent cold feet [3] Group 2 - Due to the dry weather in northern regions during winter, it is recommended to ensure adequate water intake and avoid spicy foods that may cause internal heat [5] - Foods such as water chestnuts, lily bulbs, winter melon, sugarcane, lotus root, and honey are suggested for their moisturizing properties [5] - The article highlights the significance of head warmth, suggesting massage and combing techniques to improve circulation in the head area [5]